My mail was not completely clear. Let me try again: It is a good idea to reject likely to certain spam, because in the rare cases of false positives the legitimate sender will be notified. It is also a good idea to have at least as good spam protection at the (forwarding) secondary MXes as at the primary, ***because otherwise you lose the chance to reject the spam and instead have to choose between accepting it (tagging it, filing it to a spam folder) or discarding it, or you'll end up sending a lot of collateral spam***. But what is the best way(s) to handle ".forward"-ed mail coming from friendly but slightly stupid (in the sense that they lack adequate spam protection) hosts, and how do you implement it with Exim? ***Those hosts are in a sense equivalent to your own secondary MXes, except that your users have set up the forwarding and you don't know from where.***
-- Magnus Holmgren
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